Merge XML Files Online - Free XML Merger Tool
This tool combines multiple XML files into one. Used by developers working with data exports, config files, Maven POMs, Android resources, and RSS feeds. Runs entirely in your browser, free.
Drop XML files or click to browse
Merge multiple XML files with flexible strategies
Need sample XML files for testing?
Before & After
XML merge in action
<!-- products-1.xml -->
<products>
<product id="1">
<name>Laptop</name>
<price>999</price>
</product>
</products>
<!-- products-2.xml -->
<products>
<product id="2">
<name>Mouse</name>
<price>25</price>
</product>
</products><?xml version="1.0" encoding="UTF-8"?>
<root>
<products>
<product id="1">
<name>Laptop</name>
<price>999</price>
</product>
</products>
<products>
<product id="2">
<name>Mouse</name>
<price>25</price>
</product>
</products>
</root>How It Works
Four simple steps
Upload XML Files
Drop multiple .xml files directly into the merger interface.
Choose Strategy
Select wrap, merge children, or concatenate based on your needs.
Merge Documents
Combine files while maintaining valid XML structure and namespaces.
Download Result
Get merged XML file ready for processing or validation.
Programmatic Merge
Python & Bash
import xml.etree.ElementTree as ET
def merge_xml_files(files, wrapper_tag="root"):
root = ET.Element(wrapper_tag)
for filepath in files:
tree = ET.parse(filepath)
file_root = tree.getroot()
# Add all children to new root
for child in file_root:
root.append(child)
# Create tree and write
merged_tree = ET.ElementTree(root)
merged_tree.write("merged.xml", encoding="utf-8", xml_declaration=True)
print(f"Merged {len(files)} XML files")
files = ["config1.xml", "config2.xml", "config3.xml"]
merge_xml_files(files, wrapper_tag="configurations")#!/bin/bash
# Merge XML files with wrapper element
OUTPUT="merged.xml"
WRAPPER="root"
echo '<?xml version="1.0" encoding="UTF-8"?>' > "$OUTPUT"
echo "<$WRAPPER>" >> "$OUTPUT"
for file in configs/*.xml; do
# Remove XML declaration and extract content
sed '1d' "$file" | sed '/<\?xml/d' >> "$OUTPUT"
done
echo "</$WRAPPER>" >> "$OUTPUT"
echo "Merged XML files into $OUTPUT"Use Cases
Real-world scenarios
Configuration Management
Combine environment-specific XML configs into master files for deployment or documentation.
SOAP Service Integration
Merge multiple SOAP responses into unified datasets for business logic processing.
Catalog Consolidation
Combine product catalogs, inventory lists, or content feeds from multiple sources.
Data Export Merging
Consolidate XML exports from different systems for analysis or migration.
FAQ
Common questions
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Complete Guide
In-depth walkthrough
How XML merging works — root elements and namespaces
XML requires exactly one root element. When merging two XML files, their root elements cannot both sit at the top. One wraps the other, or both become children of a new root. This is the main technical constraint when merging XML.
The tool creates a new root element that contains all child elements from both files. For example, two files each with a <users> root become one file with a new <root> element containing both <users> sections as children. All the user records from both files are preserved.
If your files use XML namespaces (xmlns attributes), the tool preserves them. Each element keeps its namespace declarations. Conflicting namespace declarations on the same element name need manual resolution after merging. For example, if both files declare xmlns:app with different URIs, you will need to fix this.
Before: file1.xml has <users><user id="1">Alice</user></users> and file2.xml has <users><user id="2">Bob</user></users>. After merging: <root><users><user id="1">Alice</user></users><users><user id="2">Bob</user></users></root>.
The merged file is valid XML with proper opening and closing tags. You can parse it with any XML library or validator. The tool handles the structural requirements so you do not have to manually edit XML tags.
Merging Android resources, Maven POMs, and RSS feeds
Android: merging strings.xml or layout files from multiple modules is common when consolidating resources. Watch for duplicate resource names (like two <string name="app_name"> entries) which Android will reject at build time. You will need to rename duplicates manually after merging.
Maven: merging POM dependency sections from multiple project configs lets you consolidate dependencies into one master POM. The tool handles the XML structure, but validate the output with mvn validate after merging to catch dependency conflicts or version mismatches.
RSS/Atom: merging feed items from multiple RSS sources into one feed file creates a combined feed. Each <item> or <entry> element from all source feeds becomes a child of the merged feed. Useful for aggregating blog posts or news from multiple sources.
SOAP/API responses: combining XML payloads from paginated API calls into one document. If an API returns 100 records per page across 10 pages, merge all 10 XML responses into one file for easier processing. Each response body becomes a child element in the merged output.
What to check after merging
Validate the output with an XML validator before using it. Run xmllint --noout file.xml in the terminal (exits with code 0 if valid), or paste the XML into jsonformatter.org/xml-formatter to check for errors. Invalid XML will break parsers and processing tools.
Check for duplicate IDs or attribute values if your schema requires uniqueness. For example, if both source files have <product id="123">, the merged file will have two elements with the same ID, which may violate your schema or cause processing errors.
Check namespace declarations at the root element. If your source files use namespaces, verify that all necessary xmlns declarations are present in the merged output. Missing namespace declarations cause parsing failures in XML processors that validate against schemas.